linux-kernel - Re: BUG in 2.6.18.1?

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Message-ID: <4532CC4C.6030005@comcast.net>
Date:	Sun, 15 Oct 2006 20:03:24 -0400
From:	John Richard Moser <nigelenki@...cast.net>
To:	Larry Finger <Larry.Finger@...inger.net>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG in 2.6.18.1?

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Larry Finger wrote:
> Running 2.6.18.1, I got the following warning in my log:
> 
> Oct 15 16:24:38 larrylap kernel: BUG: warning at
> kernel/lockdep.c:565/print_infinite_recursion_bug()
> Oct 15 16:24:38 larrylap kernel:  [<c0103b3f>]
> show_trace_log_lvl+0x1af/0x1d0
> Oct 15 16:24:38 larrylap kernel:  [<c0104f4b>] show_trace+0x1b/0x20
> Oct 15 16:24:38 larrylap kernel:  [<c0104f76>] dump_stack+0x26/0x30
> Oct 15 16:24:38 larrylap kernel:  [<c0131099>]
> print_infinite_recursion_bug+0x49/0x50
> Oct 15 16:24:38 larrylap kernel:  [<c01311d5>]
> find_usage_backwards+0x65/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>]
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>]
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>]
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>]
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>]
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>]
> find_usage_backwards+0xa0/0xd0

....

Hmmm...  21 is infinite?  Interesting.

I find that it would be interesting to me personally if the kernel was
smart enough to spit out something like:

Oct 15 16:24:38 larrylap kernel:  [<c0131210>] find_[...]+0xa0/0xd0
  [21 times]

(of course, with find_usage_backwards spelled out)

After all, what if it's practical that a specific recursion would run
3000 times and it gets caught at 5000 times?  ("f**king bad design")

Just a pet peeve of mine though.
- --
    We will enslave their women, eat their children and rape their
    cattle!
                  -- Bosc, Evil alien overlord from the fifth dimension
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